Hmmmm I was not aware that browning was using chrome lined bores on these and that will make a big difference on barrel life no doubt. As for real hands on experience well I doubt I will even have any with this cartridge as there are others that I would choose way before it. I am not that keen on the std .243 Winchester although I won two of them now.
I thought the 6mm Remington was bad enough to get cases etc for thank you.
Sorry to hear about the lack of the re-barrel

but I expect you'll live.
As for burnt throats out of all the rifles I own and have owned I can put four up as having this problem:-
303 P-14 Eddystone that had been a target rifle and shot god only how many thousands of cordite 303 rounds.
22/250 BSA CF2 that was brought as project to re-barrel but came with several boxes of federal 55 Grn SP so like you do I went to the range and shot it only to find it would plonk them in five shot strings all within MOA comfortably so it too never got re--barreled and I only sold it when Bisley banned their use on the ranges due to exceeding the muzzle velocity restrictions. The BSRC were particularly hot on banning the 22/250 from their range. The throat was obviously eroded even to the naked eye yet it still shot well. The rifle was bog standard to.
270 Winchester BSA Monarch 1st pattern. brought cheap (£25) as it was well worn inside and out. Cleaned it scoped it and found that it would shoot still around MOA so cold blued the barrel and used it on and off for a few years until it got a new 7mm barrel re-chambered in 280 AI in 2011.
25-06 P-H 1200C brought this in 2010 and grouping proved challenging. Not as good as I expected so after a really good clean Steve Kershaw scopes the bore for me and the result is that the first 10" of the bore is quite badly heat crazed

which explains a lot. Again as it was used I have no ideal how many rounds it has had through it over the years or what it was used for before I acquired it. The bedding could do with improving as it's no longer perfect. That was being discussed when the troubles hit. I have put around 400 rounds through it in load development and testing the various bullets, powders and primers here is one such test:-
As I say the bedding needs improving/rectifying on this one. Of course Speer have recently dropped this bullet from production

. Just getting somewhere and have to start over again.
More common is that barrels are not cleaned properly or so I have found. Brought an old BSA Majestic as a re-barrel project (£75 with P-H scope rings attached) spent a weekend cleaning it only to find the worn barrel was actually a fouled out barrel. Once the jacket and powder fouling layers were removed the bore was actually good. there is some throat wear as one would expect on a 60 years old rifle chambered for the 270 Win cartridge but here is the first shots after teh clean and re-assembly:-
From a cold clean bore. Yes six rounds three it seems to settle in. More testing would have been done but!!!! The ammunition was Federal Fusion 150 grain I believe.
I suppose I tend to shoot more than a lot of people and it shows on the blast shield of the sound moderator:-
This is in less than a years use. Mainly 25-06 with a bit of 6.5x55 and a few .243 through it. Perhaps in future I will need to keep a shooting log to keep track of ammunition expenditure and a moderator log so one can see the wear and how long it takes to progress. It's experience like this which makes me dubious of some claims so throat life.
As said I am all up fro being pleasantly surprised.